book Maths Puzzle Numerical Ability

if we graph the equation x = 0, this is the x axis, do we say that this linear equation has many "x -intercepts"?..in other words do we say a line can "cross itself" many times?

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How do i solve this multi-step equation?




4 + x -2(x-6)= 8
The sum of two numbers is 15. Three times one of the numbers is 11 less than five times the other. Find the numbers.